20704588278 has 64 divisors (see below), whose sum is σ = 46364258304. Its totient is φ = 6109344000.

The previous prime is 20704588253. The next prime is 20704588291. The reversal of 20704588278 is 87288540702.

It is a super-2 number, since 2×20704588278² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20704588278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1456875 + ... + 1471017.

It is an arithmetic number, because the mean of its divisors is an integer number (724441536).

Almost surely, 2^20704588278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20704588278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23182129152).

20704588278 is an abundant number, since it is smaller than the sum of its proper divisors (25659670026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20704588278 is a wasteful number, since it uses less digits than its factorization.

20704588278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14741.

The product of its (nonzero) digits is 2007040, while the sum is 51.

The spelling of 20704588278 in words is "twenty billion, seven hundred four million, five hundred eighty-eight thousand, two hundred seventy-eight".